You already had two anchor references. Your physical anchor point and the peep sight. Using the nose for an anchor reference would give you three references. It'd be be more consistent for shooting long range targets - and my opinion is, the nose reference is better used with an under the chin anchor - but I don't think it's necessary for a hunting or 3D bow.

My anchor with a release is putting that big knuckle of my index finger behind the jawbone, touching my earlobe. That makes for a bone-to-bone anchor that can't move. IMO, that pretty much eliminates the need for a third reference.